Cirrus Logic CS1631 - Manual (Page 47)

CS1630/31
DS954F3 47
6.37 Configuration 55 (Config55) – Address 87
6.38 PLC Dim (PLC_DIM) – Address 89
PLC_DIM sets the second stage dim level while in PLC mode (see "Calibration Mode Operation Code" on
page 22) and Leading-edge Mode. The register value is an unsigned integer in the range of 0 value255. The
dim value prevents flashing when a command is sent to the device. If PLC_DIM = 0x00 then 0x7F is used which
is equivalent to a 50% dim value. The 12-bit PLC dim value is given by:
7 6 5 4 3 2 1 0
- - EOTP_FLP2 EOTP_FLP1 EOTP_FLP0 EOTP_SLP2 EOTP_SLP1 EOTP_SLP0
Number Name Description
[7:6] - Reserved
[5:3] EOTP_FLP[2:0]
Sets time constant of the faster low pass filter used for filtering the coarse 8-bit
ADCR temperature measurements. This filter's output is used for external
overtemperature fault detection by quickly detecting if the external NTC tem-
perature has exceeded the temperature set point Temp
Shutdown
. Its output is
also used by the Color Control System for controlling the color gain with tem-
perature for the temperature-dependent channel.
000 = No filter
001 = 233ms
010 = 466ms
011 = 933ms
100 = 1.866s
101 = 3.733s
110 = Reserved
111 = Reserved
[2:0] EOTP_SLP[2:0]
Time constant of the slower low pass filter used for filtering the coarse ADCR
temperature measurements. It's output is used for the external overtempera-
ture protection (eOTP) dim with temperature feature which decreases the sec-
ond stage dim level once the temperature measured using the external NTC
connected to pin eOTP exceeds the temperature threshold set using eOTP,
Temp
eOTP
(see “Configuration 59 (Config59) – Address 91” on page 48).
000 = 3.75s
001 = 7.5s
010 = 10s
011 = 15s
100 = 20s
101 = 30s
110 = 1min
111 = 2min
7 6 5 4 3 2 1 0
2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
PLC_DIM  16  15 + 